Routledge, 2000
Buku Teks
Winch, Christopher, author
Routledge, 2008
Buku Teks
editor Philip Cam
Korean National Commission for UNESCO, 2003
Buku Teks
Makarenko, A.S., author
Progress Publishers, 1965
Buku Teks
Wingo, Glenn Max, 1913-, author
Sterling, 1974
Buku Teks